Idiocide: A supremely stupid act that culminates in the demise of its perpetrator.
E.g. “We better tighten the steering on those Razor scooters, before someone uses them to commit idiocide.”
Edit: After writing this, I googled it, and got only 223 hits. Which, by google standards, still qualifies as having invented the term (normal result counts being more like 10e+23). In fact it apparently used to be the name of Jeremy Zawodny’s blog, although I think he meant it differently than I do . . .